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Search: id:A131237
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| A131237 |
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Number of n X (n+1) matrices with nonnegative integer entries and every row and column sum <= 2. |
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+0
2
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| 1, 6, 79, 1837, 66021, 3374176, 231848191, 20570267229, 2285620096717, 310524073877026, 50598503336716611
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.65(a).
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CROSSREFS
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Cf. A049088, A131235, A131236.
Sequence in context: A093033 A123796 A129524 this_sequence A024082 A132547 A132616
Adjacent sequences: A131234 A131235 A131236 this_sequence A131238 A131239 A131240
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KEYWORD
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easy,more,nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)Eunet.yu), Jun 20 2007
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